Make shelf item can be dragged when context menu is opened.

ash/shelf/shelf_view.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/shelf/shelf_view.h"
 
 #include <algorithm>
 #include <memory>
 
 #include "ash/ash_constants.h"
@@ skipping 624 matching lines @@
   // Ignore if this is a repost event on the last pressed shelf item.
   int index = view_model_->GetIndexOfView(view);
   if (index == -1)
     return false;
   return !IsRepostEvent(event) || last_pressed_index_ != index;
 }
 
 void ShelfView::PointerPressedOnButton(views::View* view,
                                        Pointer pointer,
                                        const ui::LocatedEvent& event) {
+  if (IsShowingMenu()) {
+    launcher_menu_runner_->Cancel();
+  }
   if (drag_view_)
     return;
 
   int index = view_model_->GetIndexOfView(view);
   if (index == -1 || view_model_->view_size() <= 1)
     return;  // View is being deleted, ignore request.
 
   if (view == GetAppListButton())
     return;  // View is not draggable, ignore request.
 
@@ skipping 1167 matching lines @@
   if (pointer == TOUCH &&
       (base::TimeTicks::Now() - touch_press_time_) <
           base::TimeDelta::FromMilliseconds(kTouchDragTimeThresholdMs)) {
     return false;
   }
 
   return true;
 }
 
 }  // namespace ash